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BiologyNothobranchius cardinalis is found in residual, ephemeral pools, which would dry up completely on a seasonal basis; except for some grasses on the banks that hung over into the water, the pool of the type locality was devoid of vegetation of any sort; the substrate comprised a thick layer of very fine, soft, black mud (Ref. 74420). Eggs deposited in the substrate by the adult fish survive therein through the dry season, experiencing numerous phases of development with intervening diapauses; the eggs then hatch at the onset of the following rainy season (Ref. 74420).